Ostrich leg bone
Nice and overlooked material for knife handles.
The natural hollowness can easily be filled with for example epoxy glue.
From captive bred birds.
Note: Measurements (length x size of one end oval / size of opposite end oval) are approximate and typical.
You get the very piece that you click on.
The bones are all hollow and the thickness of the wall varies. The more expensive ones are of course with a nice able oval for a knife handle - and typical with a bit more wall than the cheaper ones.